Diagnostic dilemmas in gynecologic and obstetric pathology.

Four difficult differential diagnoses in gynecologic and obstetric pathology are reviewed. These include (1) sarcoma-like mural nodule in ovarian tumors versus ovarian sarcomas, (2) early blastocyst versus choriocarcinoma, (3) hydropic abortus versus partial hydatidiform mole, and (4) regressing implantation site versus placental site trophoblastic tumor. The author's own interpretation and recommendations are presented.